Image Position Correction in Wire Winding Drives
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Solution Overview
Problem
Existing image forming apparatuses face challenges in accurately correcting the image formation position due to individual differences in reading apparatuses, leading to reduced precision and errors in image alignment, especially when using wire winding drives for wide scanning.
Innovation Solution
The apparatus includes a reading unit, an image processing unit, an image forming unit, a storage unit, and a generation unit that form and read measurement images to generate correction conditions, reducing the influence of individual differences in the reading apparatus and improving image formation position correction precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a reading apparatus with wire winding drive is used for wide scanning, then scanning coverage is improved, but read error occurs due to carriage tilt and bending of rail or eccentricity of pulley
Solution Approach 1:
The patent applies preliminary action by pre-storing the individual difference data (tilt characteristics) of the reading apparatus in advance. Before actual image formation, the system retrieves this pre-stored data to generate correction conditions, thereby compensating for the carriage tilt and scanning errors that would otherwise occur during wide scanning operations.
Solution Approach 2:
The patent changes parameters by adjusting the image formation position based on the stored individual difference data. The system modifies the scanning parameters and position correction values according to the pre-measured tilt characteristics of the specific reading apparatus, thereby compensating for the mechanical imperfections of the wire winding drive system.
2Manufacturing precision
If image formation position is corrected based on reference image reading, then position alignment is improved, but correction precision is reduced due to individual difference in reading apparatus
Solution Approach 1:
The patent implements feedback by using the stored individual difference data from the reading apparatus to continuously adjust and refine the image formation position correction. The system feeds back the tilt characteristics and scanning errors into the correction algorithm, enabling dynamic compensation that maintains high correction precision despite variations in reading apparatus performance.
Solution Approach 2:
The patent introduces an intermediary element - the pre-stored individual difference data - that mediates between the reading apparatus and the image formation system. This intermediary data layer acts as a buffer that translates the physical imperfections of the reading apparatus into correctable parameters, thereby isolating the image formation process from the variability of the reading apparatus.
3Length of moving object
If carriage moves in wire winding drive system, then wide scanning capability is achieved, but tilt occurs due to bending of rail or eccentricity of pulley
Solution Approach 1:
The patent measures and stores the carriage tilt characteristics under various scanning conditions in advance. By performing this calibration action beforehand, the system creates a reference database of tilt angles and positions that can be used to predict and correct tilt during actual wide scanning operations without requiring real-time mechanical adjustments.
Solution Approach 2:
The patent compensates for carriage tilt by dynamically changing the image formation parameters based on the stored tilt data. The system adjusts the vertical and horizontal positioning parameters according to the predicted tilt angle, thereby maintaining proper image orientation and shape despite the physical tilt of the carriage during wide scanning.
Data Source
AI summary
An image forming apparatus forms a measurement image on a sheet, moves a carriage to read the measurement image, reads from a storage unit an adjustment condition, generates a correction condition based on the adjustment condition and a result of reading the measurement image, moves the carriage to read an original, generates image data of the original, corrects a position at which an image is formed on a sheet based on the correction condition and forms an image of the original on a sheet based on the corrected image data.